Trip mechanism for printing presses



Jan. 12, 1932. c. c. SWEET ET AL 1,840,750

TRIP MECHANISM FOR PRINTING PRESSES Filed Aug. 8, 1930 4 Sheets-Sheet lC0 1 C, W

Jan. 12, 1932. c. c. SWEET ET AL TRIP MECHANISM FOR PRINTING PRESSES IFiled Aug. 8, 1930 4 Sheets-Sheet 2 OJ 6 f 4 5 8 I \l I w /5 a; /6 m /72a /5 /8 P k q o J/ 4 y if 55 grm'nto'r W C, W

Jan. 12, '1932. c. c. SWEET ET AL 1,840,750

TRIP MECHANISM FOR PRINTING PRESSES Filed Aug. 8, 1930 4 Sheets-Sheet, s

4 5, x x 57 L T Q I Z? L, I I :::::J I o 55 5g 5* Z '5' 60 28 5 2:1 1 46 g -19) 55 54 4 2 55 6x9 Z3 58 58 6 59 /A X) I fifi; 0v 1/6 4 3 T'gwwntms M C. W

Jan. 12, 1932. c. c SWEET ET AL 1,840,750

- TRIP MECHANISM FOR PRINTING PRESSES Filed Aug. 8, 1930 4 Sheets-Sheet4 g f an on W01 I 1 I. M C W Patented .Ean'. a2, 1932 means stares mrsnreasier cam. e. swnrrr, or MILWAUKEE, AND WILLIAM J. BAYER, or snonnwoon,WISCONSIN,

'ASSIGNORS T CLAYBOURN PROCESS OOBPQRATION,

A CQREORATION 0E WISCONSIN OF MILWAUKEE, WISCONSIN,

raw morrmsm roa PRINTING rnnssns Application filed August 8, 1930.Serial No. 478,900.,

The invention relates to trip mechanism I for printing presses wherebyin the event of sheet or sheets to be fed to linders will be moved thefailure of a the press, the plate cy sion cylinder so that the parts ofthe press will not be damaged. The ob ect .of the present invention isto provide a trip mech-- anism wherein the controlling means is arrangedconcentric with the axis of the impression cylinder and whereinpreferably the power necessary to move the plate cylinders out ofregistry with the impressioncylinder is derived from the same rotating saft as that that carries the impression cylinder. The invention is moreparticularly characterized by the fact that a cam is mount ed to rotatein unison with the impression cylinder and is operatively connected withthe plate cylinders for moving the same into or out of printing positionand has switching mechanism associatedtherewith to determine theposition in which the plate cylinders will be placed relative to theimpression cylinder dependent upon the condition of the press.

The invention further consists in the several features hereinafter setforth and more particularly defined by claims at the conclusion hereof.

1n the drawings Fig. 1 is an end elevation view of a press equipped withthe trip mechanism embodying the invention,' parts being broken away;

Fig. 2 is a detailed sectional view taken on the line 2-2 of Fig. 1;

Fig. 3 is a view looking into the interior of the trip cam, the samebeing taken on a section generally along the line 3-3 of Fig. 4, artsbeing broken away;

Fig. 4 is a detailed sectional View taken on the line 4-4 of Fig. 3;

Fig. 5 is a detailed sectional view taken along the line 5 5 of Fig. 3;

Fig. 6 is a detailed sectional view taken on the line 6.6 of Fig. 2.

For the purpose of illustrating the invention I have shown a multi-colorprinting press wherein three plate or printing cylinders designated ingeneral by the numeral 8 are grouped about a single impression cylinder9 and wherein the sheet is delivered to the impression cylinder from arotary feed device 10 ofany suitable construction and the printed sheetis removed from the impression cylinder through a rotary delivery device11 of any suitable construction.

Referring to Figures 1 and 2 the im ression cylinder 9 is mounted on asha t '12 which is driven by any suitable source of power and rotates inthe journal bushings 13 that are mounted in the end frames 14 of thepress. Each of the plate cylinders 8 as shown more particularly in Fig.2 has a shaft 15 journalled in a bushing 16 which bushin fits aneccentric bushing 17 )that in turn is afapted to rotate in a bore 18that is eccentric to the axis of rotation of the shaft 15. Each end ofthe shaft for each plate cylinder is thus journalled and mounted foreccentric movement relative to the end frames 14. Each plate cylindercarries a gear 19 at one end of itsshaft which when the cylinder is inprinting position meshes with a gear 20 secured to the shaft 12 of theimpression cylinder so that all the plate cylinders are revolvedsimultaneously with the turning of the shaft 12 from the power sourceand the ratio of the gears 19 and 20 are such that the plate cylindersmake two revolutions to each one of the impression cylinder and this isalso true of the rotary feed and delivery devices 10 and 11 so that twosheets are handled on the impression cylinder for each revolutionthereof.

The eccentric bushings 17 at each end of the plate 0 linders are asshown in Fig. 6 each provi ed with a crank arm portion 21 and a link 22operatively connects each one of these crank arms to a crank arm 23secured to a shaft 24 journalled in bearings 25 in the end frames 14.Hence it will be observed that oscillation of the shaft 24 will act toturn the eccentric bushing 17 at each end of the shafts 15 of the platecylinders so as to move the plate cylinders either into or out ofprinting relation with the impression cylinder 9. In each instanceoscillation of the shaft 24 is effected through acrank arm 26 connectedby a link 27 with a lever 28 pivoted at 29 to an end frame 14 of themachine. The 100 pin 30 that pivotally connects the link 27 with thefree end of the lever 28 carries a roller 31 which is adapted to work ineither of the cam tracks 32 or 33 of the grooved cam 34, which cam hasits hub 35 mounted to revolve with the power driven shaft 12 of theimpression cylinder. With this construction, when the rollers 31 on thelevers '28 are disposed to work in the cam track 32 the plate cylinderswill be held by the linkage above described in printing relation withthe impressioncylinder. In the event however of the failure of a sheetto be delivered to the im' ressi-on cylinder, a mechanism hereinafterescribed is provided for switching the rollers 31 from the groove 32 tothe groove 33 and this mechanism during its switching movement actsthrough the link 27 and crank 26 to oscillate the shaft 24 and throughthe links 22 and crank arms 21 to turn the eccentric bushings 17 so asto shift the shaft 15 of each plate cylinder away from its normaloperating position and thus move the plate cylinders out of registrywith the impression cylinder 9 and thereby prevent any printing.

For actuating and controlling the position of the roller 31 themechanism shown more particularlyin Figures 1 and 3 is provided. Mountedto rotate with the cam 34 are a pair of diametrically disposed switchinglevers 36, each lever being pivoted on a pin 37 carried by the cam 34,said levers being limited in their arc of movement by movement against astop shoulder or recess 38 formed on the outer face of the cam track 33and a stop shoulder or recess 39 formed on the inner face of the camtrack 32. Each lever is held in either one of its stop positions by atoggle mechanism which comprises a rod 40 pivotally connected at one endto a pin 41 on the intermediate part of the lever 36 and working in anarcuate slot 42 in the cam 34 and both pivotally and slidably connectedat its other end in a block 43 that is free to oscillate in the camplate, a spring 44 being mounted between the head of the rod and theblock 43. The result of this construction is that the spring 44 actingthrough the rod 40 upon the pin 41 connected with the lever serves tohold the lever in either of its stop positions when the lever has beenswung to. this position by mechanism hereinafter described.

Means are provided to always move the levers 36 into the position wherethey will guide the rollers 31 along the cam grooves 32. This consistsof a stationary cam plate 45 arranged in the path of the rollers 46, onpins 41 connected to the switching levers 36, and disposed in the regionof the vertical axis through the cam 34 and the impression cylinder atthe upper portion of the press.

In the event thata sheet is not fed to the press certain automaticrelease mechanism which comprises no part of the present invention andwhich may be of several different forms offered by manufacturersspecializing in this type of equipment is employed to actuate -a releaserod 46 which is connected through a resetable lever 47 and a link 48to'a bell crank lever 49 which in turn is connected by a link 50 toanother bell crank lever 51 connected by a link 52 toanother bell cranklever 53 pivoted at 54 which lever is in turn connected by a link 55with a throw-out lever 56 ivoted at 57 upon a front plate 57' suita lybolted to but in spaced relation with the adjacent end frame The lever56 is releasa- 14 of the machine. bly held in its extreme positions ofmovement by a pivoted detent lever 58 which is urged by a spring 58'into engagement with one of the notches 59 in a quadrant 60 associatedwith the lever 53. The throw-out lever 56 when moved inwardly from theposition shown in Fig. 3 comes into the path of movement of the rollers46 on the pins 41 and as the levers 36 carrying these rollers arerevolving with the cam 34 and as said pins are connected with theintermediate portions of said levers 36 it will be observed that underthese conditions each of the levers 36 will be swung inwardly from thefull line position to the dotted line position shown in Fig. 3 as saidlevers travel past said throw-out lever during the operation of thepress. Consequently, as these levers 36 have been moved to their innerdotted line positions when the cam with which they are turning comes toone of the rollers 31, the same is engaged by the lever 36 and is movedout of the path defined by the groove 32 and over into the path definedby the groove 33 and as we have already seen during this switchingmovement the plate cylinders are moving out of registry with theimpression cylinder and thereafter for the remainder of the revolutionthe impression cylinders are held out of registry until the cam 34 movesaround to again reset the levers 36 through the action of the cam 45 butif under these conditions the feeding mechanism is not operating thenext printing cycle of the press will also be rendered inoperative dueto the fact that the throw-out lever 56 is again in position to;

move the next lever 36 to the throw-out position and thus again move theplate cylinders out of registry with the impression cylinder.

If feeding conditions have been reestab-,

the machine, consisting of a cam 63 rotating in cyclic synchronism withthe machine and engaged by a roller 64 on a bell crank lever 65connected by a link 66 with the lever 61 with the result that until thecam 63 rotates to a certain position the operator cannot press down onthe lever 61 and thus pull up on the lever 47 to reset the throw-outmechanism since the downward movement of the lever 61 is through thelink 66 communicative to the bell crank 65 tomove the roller 64 upagainst the cam 63. It will be-observed from Fig. 1 that cams 67 mountedon the cam plate 34: are provided which are disposed in the path ofrollers mounted on the pivot pin connecting the lever 53 with the link55 with the result that in certain phases of operation of the cam thethrow-out lever 56 cannot be moved inwardly,

From the foregoing description it will be noted that we have rovided atrip mechanism for rotary printing presses in which the plate cylindersare moved out of registry with the impression cylinderby meanscontrolled and operated from a cam rotating in unison with theimpression cylinder and that the cam provides means for holding thecylinders either in their on or-ofi' position, that the control meansassociated with the cam is automatically reset for each revolution ofthe press but that even though reset it the throw-out lever is still ina non-feeding-sheet position, the cylinders will again be moved out ofregistry with the impression cylinder to revent printing.

e desire it to be understood that this invention is not to be limited toany particular form or arrangement of parts except in so far as suchlimitations are included in the claims.

What we claim as our invention is:

1. In a printing press, the combination of a rotary impression cylinder,printing. cylinders grouped about and cooperating with said impressioncylinder, means for moving each of said printing cylinders into and outof printing relation with said impression cylinder, a rotary camprovided with spaced tracks determining the on and 0d position of saidprinting cylinders and associated with a part of the moving means ofeach printing cylinder, and switching means between the tracks of thecam cooperating with said parts of said printing cylinder moving meansto actuate the latter, said cam and switching means rotating in unisonwith said impression cylinder.

2. In a printing press, the combination of a rotary impression cylinder,printing cylinders grouped about and cooperating with said impressioncylinder, means for moving each of said printing cylinders into and-outof printing relation with said impression cylinder, a rotary camprovided with spaced tracks determining the on and ofl position of saidprinting cylinders and associated with a part of the moving means ofeach printin cylinder, switching means between the trac s of the camcooperating with said parts of said printing cylinder moving means toactuate the latter, said cam and switching means rotating in unison withsaid impression cylinder, throw-out means to shift said switching meansto the off position for said printing cylinders, and means to reset saidswitching means to the on position of said printing cylinders at eachrevolution of the impression cylinder.

3. In a printing press, the cpmbination of a frame, an impressioncylinder mounted to rotate on said frame, printing cylinders groupedabout and cooperating with said impression cylinder, bearing members forthe shaft of each printing c linder journalled in said frame eccentricto the axis of the shaft of that printing cylinder, means including alever for oscillating the bearing members of each printing cylinder tomove said cylinder into and out ofprinting relation with said impressioncylinder, a cam rotating in unison with the impression cylinder andhaving spaced tracks in which a part of the said leverswork and by whichsaid printing cylinders are maintained in on or ofi printing position,switching means associated with said tracks and engageable with saidlevers to move the same, means for setting said switching means, andmeans for maintaining said switching means in set position; 4. In aprinting press, the combination of a frame, an impression cylindermounted in said frame, printing cylinders grouped about and cooperatingwith said impression cylinder, bearing members for the shaft of eachprinting cylinder, journalled in said frame eccentric to the axis of theshaft of that printing cylinder, means including a lever for oscillatingthe bearing members of each printing cylinder to move said cylinder intoand out of printing relation with said impression cylinder, a camrotating in unison with said impression cylinder and having spacedtracks in which a part of the said levers work and by which saidprinting cylinders are maintained in on or off printing position,pivoted switching members associated with said tracks and engageablewith said levers to move the same, means for setting said switchingmembers, and toggle'mechanism associated with each switching member tomaintain it in set position.

5. In a printing press having automatic release mechanism, thecombination of a rotary impression cylinder, printing cylinderscooperating with said impression cylinder, means for moving eachprinting cylinder into and out of printing relation with said impressioncylinder, a rotary cam provided with spaced tracks determining the onand oil position of said printing cylinders and provided with switchingmeans for moving said printin cylinder moving means,- throw-out means orsaid shifting means adapted to be operated by the automatic releasemechanism of the press, means for releasably holding said throw-outmeans in operative or inoperative position, and means to reset saidswitching means to the on position of said printing cylinders at eachrevolution of the impression cylinder.

In testimony whereof, We afiix our signatures. CARL 0. SWEET. WM. J.BAYER.

